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I hate to do this, but I have to disagree billva. My company did research on the Dynamic Air filter and found it actually less restrictive and some throw aways. Works off of 24 volts from the air handler. Highly recommended for those with allergies or who just want cleaner air. Warning....they're not cheap though.

eddy, alot of people buy more than one washable filter, they swap out the dirty one with a clean one, then clean the dirty one and set it aside to dry. That way they're not running the system with no filter at all.